package com.vanvalt.payhui.util.encrypt;

/**
 * @author Xiaoyang
 *
 */
import java.io.IOException;  
import java.security.SecureRandom;  
  
import javax.crypto.Cipher;  
import javax.crypto.SecretKey;  
import javax.crypto.SecretKeyFactory;  
import javax.crypto.spec.DESKeySpec;

import org.apache.commons.codec.binary.Base64;

   
public class DesUtil {  
   
    private final static String DES = "DES";  
    private final static String KEY = "kEHrDooxWHCWtfeSxvDvgqZq";
   
    public static void main(String[] args) throws Exception {  
    	
    	System.out.println("pass1="+new sun.misc.BASE64Encoder().encode("111111".getBytes()));
        System.out.println("password2="+new Base64().encode("111111".getBytes()));
         
        String data = "111111";  
       // String key = "kEHrDooxWHCWtfeSxvDvgqZq";  
        System.err.println(encrypt(data, KEY)); 
        String encryptPassword = encrypt(data, KEY);
        System.out.println("加密后："+encryptPassword);
        System.err.println(decrypt(encrypt(data, KEY), KEY));  
        System.out.println("解密后："+decrypt(encryptPassword, KEY)); 
        //System.out.println(decrypt("JF5dX/TlOg529KAhh+vywjzIp5Msktmf", key)); 
        
    }  
       
    /** 
     * Description 根据键值进行加密 
     * @param data  
     * @param key  加密键byte数组 
     * @return 
     * @throws Exception 
     */  
    public static String encrypt(String data, String key) throws Exception {  
        byte[] bt = encrypt(data.getBytes(), key.getBytes());  
        String strs = new sun.misc.BASE64Encoder().encode(bt);
        
        return strs;  
    }
   
    /** 
     * Description 根据键值进行解密 
     * @param data 
     * @param key  加密键byte数组 
     * @return 
     * @throws IOException 
     * @throws Exception 
     */  
    public static String decrypt(String data, String key) throws IOException,  
            Exception {  
        if (data == null)  
            return null;  
        sun.misc.BASE64Decoder decoder = new sun.misc.BASE64Decoder();  
        byte[] buf = decoder.decodeBuffer(data);  
        byte[] bt = decrypt(buf,key.getBytes());  
        return new String(bt);  
    }  
   
    /** 
     * Description 根据键值进行加密 
     * @param data 
     * @param key  加密键byte数组 
     * @return 
     * @throws Exception 
     */  
    private static byte[] encrypt(byte[] data, byte[] key) throws Exception {  
        // 生成一个可信任的随机数源  
        SecureRandom sr = new SecureRandom();  
   
        // 从原始密钥数据创建DESKeySpec对象  
        DESKeySpec dks = new DESKeySpec(key);  
   
        // 创建一个密钥工厂，然后用它把DESKeySpec转换成SecretKey对象  
        SecretKeyFactory keyFactory = SecretKeyFactory.getInstance(DES);  
        SecretKey securekey = keyFactory.generateSecret(dks);  
   
        // Cipher对象实际完成加密操作  
        Cipher cipher = Cipher.getInstance(DES);  
   
        // 用密钥初始化Cipher对象  
        cipher.init(Cipher.ENCRYPT_MODE, securekey, sr);  
   
        return cipher.doFinal(data);  
    }  
       
       
    /** 
     * Description 根据键值进行解密 
     * @param data 
     * @param key  加密键byte数组 
     * @return 
     * @throws Exception 
     */  
    private static byte[] decrypt(byte[] data, byte[] key) throws Exception {  
        // 生成一个可信任的随机数源  
        SecureRandom sr = new SecureRandom();  
   
        // 从原始密钥数据创建DESKeySpec对象  
        DESKeySpec dks = new DESKeySpec(key);  
   
        // 创建一个密钥工厂，然后用它把DESKeySpec转换成SecretKey对象  
        SecretKeyFactory keyFactory = SecretKeyFactory.getInstance(DES);  
        SecretKey securekey = keyFactory.generateSecret(dks);  
   
        // Cipher对象实际完成解密操作  
        Cipher cipher = Cipher.getInstance(DES);  
   
        // 用密钥初始化Cipher对象  
        cipher.init(Cipher.DECRYPT_MODE, securekey, sr);  
   
        return cipher.doFinal(data);  
    }  
}  
